JP3630210B2 - Electric dust collector equipment for road tunnels - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric dust collector equipment for a road tunnel that is installed in a tunnel as a ventilation system for an automobile road tunnel and removes and cleans contaminated air sucked from a main mine.
[0002]
[Prior art]
In a long motorway tunnel that passes through mountainous areas, urban areas, etc., ventilation is performed to improve the field of view inside the tunnel. An electric dust collector combined with a blower is installed in the airflow path of a longitudinal ventilation tunnel (bypass tunnel) that returns to the mine tunnel, or a cross-flow ventilation tunnel that branches from the main mine and leads to a ventilation tower installed on the ground outside the tunnel. Contaminated air inhaled from the main mine (air in the main mine is contaminated with automobile exhaust gas (smoke), suspended dust, etc., and the visibility has deteriorated) is cleaned by removing dust with an electric dust collector. .
[0003]
3 (a) to 3 (c) show the longitudinal ventilation system of the road tunnel described above. In the figure, 1 is the main tunnel of the road tunnel (automobile road), 2 is in the middle of the main tunnel 1 This is a vertical flow ventilation tunnel (bypass tunnel) that branches off from the main tunnel 1 with an air precipitator 3 and a blower 4 installed in the front and rear of the air passage 2 a defined inside the ventilation tunnel 2. After being cleaned by the electric dust collector 3, the clean air is discharged to the main mine 1 through the air supply duct 5 connected to the blower 4. The ventilation tunnel 2 has an auxiliary machine room 2b and an electric room 2c separated from the air passage 2a.
[0004]
Here, as shown in FIG. 3 (c), a plurality of electrostatic precipitators 3 are arranged vertically and horizontally in the air passage of the ventilation tunnel 2 so as to cross the internal space. The remaining space between the machine 3 and the tunnel 2 is blocked by a shielding plate 62d.
In addition, although the vertical flow ventilation system was shown in FIG. 3, it connected to the ventilation tower of the ventilation station equipment provided in the ground side outside the tunnel, and the ventilation air path branched to the side from the tunnel main pit 1 was installed in this ventilation station. Even in a cross-flow ventilation system that installs an electrostatic precipitator and a blower to purify contaminated air extracted from the main mine and discharge it outside the tunnel, the electric precipitator is installed in the air passage as well. .
[0005]
Next, the conventional structure of the electrostatic precipitator 3 is shown in FIGS. 4 (a) and 4 (b). As is well known, the electrostatic precipitator 3 includes a plurality of dust collecting units 3c (four units in the illustrated example) having a charging unit 3a and a dust collecting unit 3b as a pair inside a steel plate body frame (housing) 3d. In addition, the main body frame 3d has a nozzle 3 and a cleaning pipe 3e with a nozzle for washing dust collected from the dust collection portion 3b, and a door-type damper 3f on the inlet and outlet sides (this damper 3f is a dust collector). It closes when cleaning the dust of the part and serves to prevent dust from scattering around). The power supply unit is provided with a rod-shaped power supply bar inside the main body frame 3d and connected to the charging unit 3a and the dust collecting unit 3b, and is supplied with power from an external DC high voltage power source via a cable or the like.
[0006]
[Problems to be solved by the invention]
By the way, as described above, the electrostatic precipitator 3 having the structure shown in FIG. 4 is carried into the ventilation tunnel 2 shown in FIG. 3, and a plurality of electrostatic precipitators are stacked and installed at the installation point. The constructed electrostatic precipitator equipment has the following problems in terms of field installation, maintenance and inspection.
[0007]
That is, regarding the weight of the electrostatic precipitator, the weight per unit of the dust collecting unit 3c (in the case of the processing air volume 3.75 m ³ / s) incorporated in the main body frame 3d is about 285 kg (weight of the charging unit is about 35 kg). , The weight of the dust collection part is about 250 kg), but the total weight including the main body frame 3d and accessory parts (damper, cleaning pipe, etc.) is about 2.6 t (in the case of four dust collection units).
[0008]
On the other hand, when installing an electrostatic precipitator in the tunnel, work is done using a mobile forklift or a hoist provided on the ceiling side of the tunnel. As described above, the conventional electrostatic precipitator 3 has a very heavy total weight per unit. Therefore, it is difficult to install the electrostatic precipitator, and to perform a pull-out operation for inspection and repair.
[0009]
From such a viewpoint, conventionally, in order to reduce the weight of the electrostatic precipitator itself, for example, measures such as reducing the thickness of the steel sheet used for the charging part and the dust collecting part have been taken. There is a limit to the reduction of the total weight per unit including the main body frame that requires strength, and accessories such as dampers and cleaning pipes.
In addition, manufacturers of electrostatic precipitators have made it possible to meet the demands of users by grouping electrostatic precipitators of various capacities with different processing airflows in terms of specifications. However, since the external shape and size of a conventional dust collector with built-in dust collection units incorporated in the main body frame (housing) is defined by the number of dust collection units, it depends on the cross-sectional shape of the ventilation tunnel at the installation destination. There are restrictions on the arrangement and number of electrostatic precipitators placed here, and it may not be possible to efficiently install the precipitators using the space in the tunnel.
[0010]
In addition, dampers (open / close operated pneumatically or electrically) built into the main body frame of the electrostatic precipitator gradually move as dust accumulates on the bearings of the damper blades during operation of the precipitator. It becomes dull. For this reason, troublesome maintenance work is required for disassembling and cleaning the bearings of the damper in a relatively short cycle.
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to solve the above-mentioned problems, and to arrange the electric dust collector flexibly in accordance with the sectional shape of the ventilation tunnel of the installation destination, and the dust collector. It is an object of the present invention to provide an electric dust collector for road tunnels that can easily perform installation, maintenance, and inspection work, and at the same time, can perform dust cleaning for each dust collection unit in a lump.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a blower is installed in a wind tunnel of a longitudinal ventilation tunnel that branches off from a main tunnel of a road tunnel and returns to the main tunnel, or a cross-flow ventilation tunnel that leads to the atmosphere side outside the tunnel. In the electric dust collector equipment for road tunnels, in which multiple electric dust collectors are installed side by side and installed side by side, and the ventilation air taken into the ventilation tunnel from the main mine is cleaned. A dust collection unit with a frameless structure assembled in pairs is made into a unit of an electric dust collector, and the dust collection unit is placed in a prefabricated dust collection unit storage shelf built in a ventilation tunnel according to the cross-sectional shape of the tunnel. And a cleaning pipe with a nozzle for spraying cleaning water from above toward the dust collection unit at the top of the dust collection unit storage shelf. To formed (claim 1).
[0012]
Further, according to the present invention, the electric dust collector is combined with the blower in the airflow path of the longitudinal ventilation tunnel that branches back from the main tunnel of the road tunnel and returns to the main tunnel, or the crossflow ventilation tunnel that leads to the atmosphere side outside the tunnel. This is an electric dust collector equipment for road tunnels that purifies the ventilation air taken from the main tunnel into the ventilation tunnel. In the case where the machines are installed side by side, top and bottom, left and right, a dust collection unit with a frameless structure that is assembled with the charging part and dust collection part as a pair is made the unit of the electric dust collector, and the ventilation tunnel is adapted to the cross-sectional shape of the tunnel The prefabricated dust collection unit storage shelves built inside store multiple units of the dust collection units vertically and horizontally, and a damper is installed on the ventilation air outflow side of the dust collection unit storage shelves. And configure (claim 2).
[0013]
Further, according to the present invention, the following functional means are added to the dust collection unit storage shelf. (1) Drawer rails corresponding to the respective dust collection units are provided on the dust collection unit storage shelves (claim 3). (2) A DC high-voltage power supply device for applying a voltage to each dust collection unit is disposed above the dust collection unit storage shelf.
According to the above configuration, the pull-out work for installation and maintenance inspection of the electrostatic precipitator should be handled in units of frameless small and light dust collector units assembled with the charging part and dust collection part in pairs. Can do. In addition, prefabricated dust collection unit storage shelves assembled using square pipes can be freely constructed with a layout that matches the cross-sectional shape of the ventilation tunnel, the number of dust collection units installed, and the external size. Thus, the dust collection unit can be arranged in a space-efficient manner flexibly corresponding to the cross-sectional shape of the tunnel.
[0014]
In addition, by installing a drawer rail that individually mounts each dust collection unit on the dust collection unit storage shelf, the dust collection unit can be easily loaded and unloaded during installation and maintenance.
In addition, by providing a cleaning pipe with a nozzle that sprays cleaning water from the top toward the dust collection unit at the top of the dust collection unit storage shelf, dust cleaning of dust collection units arranged in multiple upper and lower stages can be performed by spraying cleaning water from above. The cleaning piping system can be simplified because it can be performed all at once. The washing waste water that has flowed down the dust collection unit is stored in a drain pit dug in the ground of the tunnel, and is sent from here to a sewage treatment device by a drain pump to dehydrate the dust.
[0015]
In addition, by installing a damper that is common to each dust collection unit on the outflow side of the dust collection unit storage shelf, a drive unit is included compared to a configuration with a damper for each individual electric dust collector. In addition to simplifying the configuration, maintenance work can be performed easily in a short time.
In addition, by placing a DC high-voltage power supply device (with power supply box) that applies voltage to each dust collection unit at the top of the dust collection unit storage shelf, the cleaning water of the dust collection unit falls on the power supply device. There is no risk of electric leakage or short-circuiting, and power can be supplied by interconnecting the power supply unit and each dust collection unit with a power supply bar with the shortest distance.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples of FIGS. In the drawings of the embodiment, the same members corresponding to those in FIGS. 3 and 4 are denoted by the same reference numerals.
In this embodiment, a prefabricated dust collection unit storage shelf 6 is constructed at the place where the electric dust collector is installed in the ventilation tunnel 2, and a plurality of baseless frames are arranged in the upper and lower rows and the left and right rows. The dust collector unit 3c is installed to constitute an electric dust collector facility.
[0017]
Here, the dust collecting unit 3c of each group is a bare assembly in which the charging unit 3a of the standard specification is paired with the charging unit 3a on the front surface of the dust collecting unit 3b. The main body frame (housing) shown in the conventional structure, and cleaning pipes and dampers incorporated in the main body frame are not equipped at all.
On the other hand, the dust collection unit storage rack 6 is constructed by assembling a frame of a shelf with square pipe pillars 6a in accordance with the cross-sectional shape of the ventilation tunnel 2, and the dust collection units 3c stored in the upper and lower rows and the left and right rows are stored 1 It has a configuration in which a pull-out rail 6b that is mounted one by one and puts in and out on the front side is incorporated. As for the detailed structure of the drawer rail 6b, for example, the same structure as that of the dust collection unit drawer rail mechanism disclosed in Japanese Utility Model Publication No. 7-33886 previously filed by the same applicant as the present invention is collected. It can be employed in the dust unit storage shelf 6. In addition, the ventilation air inflow side (front surface) of the dust collection unit storage shelf 6 remains open, whereas the outflow side (rear surface) is equipped with a damper 6c. The damper 6c is a large door-type damper common to all the dust collection units 3c housed on the shelf, or a divided structure common to the dust collection units divided in stages and arranged in a horizontal row. The door type damper can be configured. Further, on the upper side of the dust collection unit storage shelf 6, a high voltage power supply device 8 is installed in a power supply box 8 a in a support frame 7 fixed to the ceiling wall of the ventilation tunnel 2 with anchor bolts, and below that is a nozzle. A cleaning pipe 9 with 9a is provided, and cleaning water supplied from the outside is sprayed from the nozzle 9a toward the dust collection unit 3c from above.
[0018]
In addition, a hoist traveling rail 10a is laid on the ceiling side of the tunnel in front of the dust collection unit storage shelf 6, and a hoist 10 for moving the dust collection unit 3c up and down is provided here.
With this configuration, when installing an electric dust collector on the dust collection unit storage shelf 6 constructed in the ventilation tunnel 2, the dust collection units 3 c are lifted one by one by the hoist 10 and then loaded onto the work carriage 11. An operator pulls out the drawer rail 6b stored in the shelf forward, and slowly hangs the dust collection unit 3c on the drawer rail 6b. Next, the rail 6b is pushed into the shelf, and the dust collection unit 3c is set at a predetermined position. Further, between the dust collecting units 3c arranged in the left and right rows, power supply bars 8a and 8b are laid in the vertical direction and connected to the high voltage power supply device 8 placed on the support frame 7 on the ceiling side. In a state where the unit 3c is housed in a predetermined position, the power supply bars 8a and 8b are connected to the electrodes of the dust collection unit 3c and the dust collection unit 3b arranged in the upper and lower stages.
[0019]
Further, during maintenance and inspection of the dust collection unit 3c, the connection between the dust collection unit 3c at the designated position and the power supply bars 8a and 8b is disconnected in the reverse procedure to the above, and then the drawer rail 6b on which the dust collection unit is mounted is removed. Pull forward and use hoist 10 to hang down.
When the electric dust collector is in operation, a voltage is applied from the high-voltage power supply device 8 to each dust collection unit 3c with the damper 6c provided on the outflow side of the dust collection unit storage shelf 6 open. Further, when cleaning the dust collected in the dust collecting portion 3b, the voltage application is stopped, the damper 6c is closed, and in this state, cleaning water is supplied to the cleaning pipe 9, and the nozzle 9a is placed at the uppermost stage. The washing water is sprayed from above toward the dust collection units 3c. Thus, the cleaning water sequentially flows down the dust collection units arranged in the upper and lower stages, and the charging unit 3a and the dust collection unit 3b are cleaned in the flow-down process. In this case, since the ventilation air outflow side is blocked by the damper 6c, the dust scattered from the dust collection unit 3c during the cleaning does not move to the downstream side of the air passage. Then, the washing waste water flowing down the lowermost dust collection unit flows into the drain pit 12 excavated on the ground in the tunnel, and is sent from here through the drain pump 13 and the drain pipe 14 to the subsequent sewage treatment apparatus.
[0020]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained. (1) According to the configuration of claim 1, a frameless small and lightweight dust collecting unit assembled with a charging part and a dust collecting part as a unit is used for installation and maintenance of the electric dust collector. Can be handled easily. Prefabricated dust collection unit storage shelves can be freely constructed with a layout that matches the cross-sectional shape of the ventilation tunnel and the number and size of dust collection units installed. It is possible to arrange the dust collection units in a space efficient manner in a flexible manner. In addition, since the dust collection units of each group have a frameless structure, the manufacturing cost can be reduced in addition to the weight and weight per unit. Furthermore, dust cleaning of the dust collection units arranged in the upper and lower stages can be performed collectively by spraying cleaning water from above, and the cleaning piping system can be simplified.
[0021]
(2) In addition to the effect of the structure of claim 1 except for the effect of spraying the washing water, the structure of claim 2 is compared with the structure having a damper for each unit as in the conventional electric dust collector. The structure is simple and maintenance work can be done easily in a short time.
[0022]
(3) With the configuration of the third aspect, the dust collection unit can be easily put in and out of the storage shelf when installing and maintaining the dust collection unit. (4) According to the configuration of claim 4, there is no risk that the washing water of the dust collection unit will fall on the power supply device and cause a leakage or a short circuit accident, and the shortest distance between this power supply device and each dust collection unit Power can be supplied by being interconnected by a power supply bar.
[Brief description of the drawings]
FIG. 1 is a side view showing an assembly structure of an electric dust collector installed in a ventilation tunnel according to an embodiment of the present invention, and a state of dust collection unit handling work. FIG. 2 is an electric dust collector installed in FIG. Fig. 3 is a diagram showing the overall configuration of the electric dust collector equipment in the vertical flow ventilation system of the road tunnel. (A) is along the road tunnel. (B) is a longitudinal sectional view developed along the ventilation tunnel, (c) is a sectional view taken along the line AA in FIG. 4 (a). FIG. 4 shows the internal structure of a conventional electrostatic precipitator. (A) is a plan view, (b) is a side view.
DESCRIPTION OF SYMBOLS 1 Main tunnel of road tunnel 2 Ventilation tunnel 3 Electric dust collector 3a Charging part 3b Dust collection part 3c Dust collection unit 4 Blower 6 Dust collection unit storage shelf 6a Strut 6b Drawer rail 6c Damper 8 High voltage power supply device 9 Cleaning pipe 9a Nozzle 10 Hoist

Claims (4)

An electric dust collector is installed in combination with a blower in the longitudinal ventilation tunnel that returns from the main tunnel of the road tunnel and returns to the main tunnel, or in the crossflow ventilation tunnel leading to the atmosphere outside the tunnel. It is an electric dust collector equipment for road tunnels that purifies the ventilation air that has been taken in, and multiple electric dust collectors are installed side by side vertically and horizontally so as to cross the air passage in the middle of the air passage. The prefabricated type of dust collection unit is a prefabricated type that is constructed in the ventilation tunnel according to the cross-sectional shape of the tunnel. Multiple units of the dust collection unit are stored in the dust unit storage shelf vertically and horizontally, and washing water is sprayed from above toward the dust collection unit above the dust collection unit storage shelf. Electrostatic Precipitator equipment for road tunnels, characterized in that it comprises a nozzle with wash pipe. An electric dust collector is installed in combination with a blower in the longitudinal ventilation tunnel that returns from the main tunnel of the road tunnel and returns to the main tunnel, or in the crossflow ventilation tunnel leading to the atmosphere outside the tunnel. It is an electric dust collector equipment for road tunnels that purifies the ventilation air that has been taken in, and multiple electric dust collectors are installed side by side vertically and horizontally so as to cross the air passage in the middle of the air passage. The prefabricated type of dust collection unit is a prefabricated type that is constructed in the ventilation tunnel according to the cross-sectional shape of the tunnel. A road characterized in that a plurality of dust collection units are stored vertically and horizontally in a dust unit storage shelf, and a damper is provided on the ventilation air outflow side of the dust collection unit storage shelf. Electrostatic precipitator equipment for the tunnel. The electric dust collector equipment according to claim 1 or 2, wherein the dust collector unit storage shelf is provided with a drawer rail for individually mounting each dust collector unit. Equipment. The electric dust collector equipment according to claim 1 or 2, wherein a DC high-voltage power supply device for applying a voltage to each dust collection unit is disposed above the dust collection unit storage shelf. Electric dust collector equipment.

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